STUDIES ON THE CILIATES FROM FRESH WATER MUSSELS

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Abstract
Three spp. of Conchophthirius are descr. from 7 spp. of fresh water mussels from Massachusetts and New York. C. anodontae Stein, C. curtus Engl. and C. magna* (p.77) differ from one another in size; distribution, size and number of endoplasmic granules; size and number of nuclei; and in details of the external fibrillar systems. In all 3 spp. a well integrated neuromotor system is descr. and figured. It consists of an external fibrillar system, demonstrated after the Klein silver nitrate method, and an internal set of fibers, demonstrated after haematoxylin destained with 10% H2O2. A slit-like opening appears at systole of the contractile vacuole through which the contents are discharged. It is suggested that portions of the fibrillar systems may possibly function for conduction, contraction and support.

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